Yes they are useful and interesting devices. Curiously enough I've got several CY8CKIT-001B for sale, they come with daughterboards for the PSoC-1, PSoC-2 and PSoC-5
http://www.cypress.com/?rid=37464I think they've been used in a demo session, but are complete and working. Nice way to learn about the PSoC series, LCD, RS232, USB, odds and ends plus a breadboard area.
Anybody interested at £60 plus shipping PM me please.